Split Core Current Sensor SCT-0400 by Magnelab

1-75 Aac input : 333 mVac output. 0.4″ opening

Product Description

Magnelab’s SCT-0400 is a compact split core current sensor that transforms an AC input current from 1 to 75 Amps to a 0.333 Volt output.

The SCT-0400 is a split core current sensor with an opening of 0.40″ in diameter. It is ideal for installation on existing electrical wiring. It easily snaps around the conductor.

Because of its small size, the SCT-0400 is inexpensive yet it is able to monitor very low currents.  When picking an input amperage rating, consider that the unit will be able to operate at its specified accuracy from 10% to 130% of the rated current.  For example, a 75A unit can operate with 1% accuracy from 7.5A to 97.5A.

Split Core Current Sensor Frequent Applications

  • Data logging
  • Recording
  • Power monitoring
  • Energy management
  • Cost allocation

The SCT-0400 is a popular choice in multi-channel monitoring because of its low cost, small size, and ability to measure very low currents.

Compatible power meters accept a voltage input.  Look for meters on our website that start with this symbol:


If you’re new to metering you can learn more about residential monitoring. You can view all of our current sensors here.


  • Rated input from 1-75 Amp w/Output of 0.333 Volts AC
  • Operates from 50 Hz to 400 Hz
  • 8 ft twisted-pair leads
  • UL Recognized
  • Linearity accuracy +/- 1%
  • Accuracy at 10% to 130% of rated current
  • Self-locking mechanism guaranteed for 500 closings
  • 7-Year Warranty

Data Sheet

 Technical Specs


UL Registered


Made in USA

ISO 9001

rohs compliant

Additional information

Weight.075 lbs
Dimensions3.75 x 3.75 x 1.75 in